If you're interested in getting a tablet with Sprint (and now the iPad and iPad Mini are on Sprint), you have some okay-ish off contract plans: $15 for 300MB, $35 for 3GB, $50 for 6GB of data and
$80 for 12GB. If you already have a Sprint smartphone though, you get something even better: you can add 1GB of data for your tablet for $15/month. [Sprint